51169154436 has 189 divisors, whose sum is σ = 138522372583. Its totient is φ = 16531134480.

The previous prime is 51169154431. The next prime is 51169154461. The reversal of 51169154436 is 63445196115.

The square root of 51169154436 is 226206.

It is a perfect power (a square), and thus also a powerful number.

51169154436 is a `hidden beast` number, since 5 + 1 + 1 + 69 + 154 + 436 = 666.

It is a Duffinian number.

Its product of digits (388800) is a multiple of the sum of its prime divisors (135).

It is a junction number, because it is equal to n+sod(n) for n = 51169154391 and 51169154400.

It is not an unprimeable number, because it can be changed into a prime (51169154431) by changing a digit.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 720692281 + ... + 720692351.

Almost surely, 2^51169154436 is an apocalyptic number.

51169154436 is the 226206-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51169154436

51169154436 is an abundant number, since it is smaller than the sum of its proper divisors (87353218147).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51169154436 is an frugal number, since it uses more digits than its factorization.

51169154436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282 (or 135 counting only the distinct ones).

The product of its digits is 388800, while the sum is 45.

The spelling of 51169154436 in words is "fifty-one billion, one hundred sixty-nine million, one hundred fifty-four thousand, four hundred thirty-six".